Mefenpyr-diethyl

CAS 135590-91-9

EPA’s 2023 records show zero U.S. production of this chemical.

US productionZero

Import value, 2024$597M

Import volumeCBI

Confidential Business Information. The EPA withholds this volume because publishing it could reveal the reporting company's trade secrets.

Top sourceSwitzerland 53%

At least one company claimed its 2023 production or import volume for this chemical as confidential, so EPA withholds it.

Why supply is unknown

Production is reported production, not a complete census of factories. Production reporting year: 2023. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.

Where It Comes From

Customs basis: HS 293319 · basket

EPA reports by year

2023: US production Zero · Imports Confidential

These shares come from HS customs code 293319, which covers 133 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries

Country of origin for US imports, from Census customs data (2024).

CH 53%SwitzerlandDE 22%GermanyIN 14%IndiaCN 4%ChinaIT 3%Italy

Sweden
Ukraine
Taiwan
Spain
Canada
Portugal
Slovakia
New Zealand
Netherlands
Croatia
Latvia

EPA-registered importers (2)

Companies that report making or importing this chemical to the EPA. Registration is US-centric and does not indicate import origin.

Bayer Ag · DE Germany

Bayer Us Holding

Why It Matters

Sectors

Agriculture

Downstream UsesNot recorded

FDA Shortage Status

Whether any manufacturer currently reports this drug as in shortage on the FDA Drug Shortages database. "Active Shortage" means at least one presentation has status "current."

No FDA shortage records

Industrial Uses

•Intermediate in Pesticide, Fertilizer, and Other Agricultural Chemical Manufacturing (100%)Processing as a reactant

Chemical Identity

CAS135590-91-9

PubChem CIDNot recorded

DTXSIDDTXSID6037564

FormulaC16H18Cl2N2O4

Mol. Weight373.23 g/mol

SMILESCCOC(=O)C1=NN(C2=C(Cl)C=C(Cl)C=C2)C(C)(C1)C(=O)OCC

Data Sources

EPA CompTox (DSSTox) · DTXSID6037564Retrieved 2026-10-04
EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04
EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04
US Census international tradeReporting year: 2024 · Retrieved 2026-10-04

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Brief citations

Mefenpyr-diethyl (CAS 135590-91-9) https://chemicalindependence.com/chemical/135590-91-9/ EPA CompTox (DSSTox): DTXSID6037564. Retrieved 2026-10-04. https://comptox.epa.gov/dashboard/chemical/details/DTXSID6037564 EPA Chemical Data Reporting: 135590-91-9. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 135590-91-9. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 293319 for CAS 135590-91-9. Reporting year: 2024. https://usatrade.census.gov/